Well - here's my "crazy" prediction / guess: Not earlier that 21st ... DUH! ... but - December! As many of you're deducting it will be after the fan fests:

Moogle Attire bonus codes may be redeemed immediately on the Mog Station (http://sqex.to/Msp) however the item will not be delivered in-game via the moogle delivery service until the conclusion of the Tokyo Fan Festival on December 21, 2014.